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jsp域物件對應EL表示式域物件

(1)pageScope:獲取jsp中pageContext域屬性,相當於pageContext.getAttribute("xxx")
(2)requestScope:獲取request域屬性,相當於request.getAttribute("xxx")
(3)sessionScope:獲取session域屬性,相當於session.getAttribute("xxx")
(4)applicationScope:獲取application域屬性,相當於application.getAttribute("xxx")      
        【jsp中】         【EL表示式中】       
         Page             pageScope
         Request
requestScope Session sessionScope Application applicationScope

範圍由小到大:

pageScope / requestScope / sessionScope / applicationScope